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讨论题 3 、 4

讨论题 3 、 4. 1. 请编写程序，要求每按一次键，发光二极管位置右移 1 次。 ORG 0000H LJMP MAIN ORG 0013H LJMP ZH ORG 0100H MAIN: MOV SP, #50H SETB IT1 ; 外部中断 1 SETB EA ;CPU 开中断. SETB EX1 MOV A, #07FH

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讨论题 3 、 4

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  1. 讨论题3、4

  2. 1. 请编写程序，要求每按一次键，发光二极管位置右移1次。 ORG 0000H LJMP MAIN ORG 0013H LJMP ZH ORG 0100H MAIN: MOV SP, #50H SETB IT1 ;外部中断1 SETB EA ;CPU开中断

  3. SETB EX1 MOV A, #07FH LP: MOV P1, A ;输出 JB P3.3, ZH SJMP LP ZH: RR A MOV P1, A LCALL DEL RETI DEL: MOV R5, #20 D1: MOV R6, #20 D2: MOV R7, #250 DJNZ R7, $ DJNZ R6, D2 DJNZ R5, D1 RET END

  4. 2. 请编写程序，每按一次按键流水灯的流动方向改变一次，要求使用中断技术处理按键。 ORG 0000H ;定义下一条指令的地址LJMP MAIN ;转向主程序ORG 0013H ;安排外部中断1处理程 序的第一条指令LJMP KEYS ;直接转移到中断处理程序ORG 0100H ;主程序起点MAIN: MOV SP,#40H ;设置堆栈栈底指针SETB IT1 ;设置外部中断1的中断方式 为下降沿中断SETB EX1 ;开放外部中断1 SETB EA ;开放总中断MOV A, #01H ;#01H送累加器A

  5. L1: MOV P2, A ;累加器A中内容送P2口MOV R7, #0FFH ;#0FFH送R7寄存器L3: MOV R6, #0FFH ;#0FFH送R6寄存器L2: DJNZ R6, L2 ;R6寄存内容-1,结果≠0转移至L2 DJNZ R7, L3 ;R7寄存内容-1,结果≠0转移至L3 JNB FX, L4 ;FX=0时转移到L4 RL A ;累加器A中内容左移一位SJMP L5 ;转移至L5L4: RR A ;累加器A中内容右移一位L5: SJMP L1 ;转移至L1

  6. ;按键中断程序;入口:外部中断1;功能:确认按键后改变方向标志FX的状态KEYS: ;中断处理程序入口MOV R7,#20H ;首先延时去抖K1: MOV R6, #0FFH DJNZ R6, $ DJNZ R7,K1 JB KEY, K2 ;延时完成后再检测按键CPL FX ;确认按键按下,改变方向标志位状态

  7. K2: RETI ;中断结束返回KEY BIT P3.3 ;定义按键变量FX BIT 00H ;定义位变量,用于判断方向END ;结束

  8. 设计一个数码管显示电路，要求数码管以闪光方式轮流显示0～F共16个字符，闪光频率为2Hz，每个字符显示1s。ORG 0000H LJMP MAIN ;跳转到主程序入口ORG 000BH ;定时计数器0中断入口LJMP CTC0 ;跳转到定时计数器0中断程序ORG 0100HMAIN: MOV TMOD,#01H ;设定定时计数器0为工作方式1 MOV TH0,#CTH ;设置计数器初值MOV TL0,#CTL

  9. SETB TR0 ;启动定时计数器0 SETB ET0 ;开定时计数器0中断SETB EA ;开总中断SETB SBZ ;设置定时标志MOV S1,#0 MOV XSS,#0 MOV MS250,#0PROG1: MOV DPTR,#ZXB ;数据指针指向字 形表首地址WAIT: JBC SBZ, PROG2 SJMP WAIT

  10. PROG2: CPL SGBZ JB SGBZ,PROG3 MOV A,#00H SJMP PROG6PROG3: MOV A,XSBUFPROG6: MOV P1,A INC S1 MOV A, S1 CJNE A, #4, WAIT MOV S1,#0

  11. INC XSS MOV A, XSS CJNE A, #10, PROG5 MOV XSS, #0 MOV A,#0 PROG5: MOVC A, @A+DPTR MOV XSBUF, A PROG4: SJMP WAIT00H END

  12. ;以下为定时计数器0中断程序,中断每50mS产生一次CTC0: PUSH ACC ;保护现场MOV TH0, #CTH ;恢复计数器初值MOV TL0, #CTL INC MS250 ;中断次数累计MOV A, MS250 ;判断是否已中断5次,未到5次中断返回CJNE A, #5, CTC1 MOV MS250, #0;已到5次,计数器清0 SETB SBZ ;设置250mS计时标志CTC1: POP ACC ;恢复现场RETI ;中断返回

  13. ;以下为数据设置 MS250 DATA 30H ;250mS秒计数器S1 DATA 31H ; 1秒计数器XSBUF DATA 32H ; 存放显示字型码XSS DATA 33H ;存放显示数字SBZ BIT 00H ; 250mS时间标志SGBZ BIT 01H ;闪光标志CTH EQU 15536 / 256 ;定时计数器0初值高位CTL EQU 15536 MOD 256 ;定时计数器0初值低位ZXB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H DB 80H,90H,88H,83H,0C6H,0A1H,86H,8EH END ;程序结束

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